Pipe-threading die



F. W. COX ET AL Dec. 21

PIPE THREADING DIE Filed August 9,

Patented fies. 21, 1926.

- UNITED 'sTAT PATENT smear FREDERIG W; COX AND CHARLES F. COX, OF'BRIDGE'ION, NEW JERSEY, ASSIGNORS TO THE OOXAND' SONS COMPANY, OFBRIDGETON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PIPE-.TI-IREADING DIE.

Application filed. August 9, 1923. Serial No. 656,486.

This invention relates to improvements in )ipe threjading dies of thetypeforming the subject of the copending application of W'arren E.Glaspey and Frederic WV. Cox, Se-

rial Number 598,575, now Patent No. 1,569,-

740, issued January 12,1926, and relates more particularly toimprovements in the construction of the chaser holders andin the methodsfor adjusting and securing the chascrsin the holders a Z One object ofthe invention is to provide means for insuring retention of the chaserin the holder iwithout slippage, and another object of the invention isto provide means for. obtaining a uniform position of the chasers intheir respective holders.

, The means by which We attain'the aforesaid objects are clearlyillustrated in the at tached drawings, inwhich:

Figure 1, is a face View of a holder with the chaser inplace; I v

Fig. 2, is a side view of the said holder and chaser; i

Fig. 3, is a detached perspective view of the chaser; and

I ig.-l,-is a detachedperspective view of the ch aser' clamping elementof the holder.

With reference to the drawings, 1 indicates the holder Which, as fullydescribed in the copending application of Warren E. Glaspey and FredericW. Cox, is adapted for insertion in a die and Which for the purpose ofthe present invention may be considered as comprising a main bodyportion 2 having a beveled recess 3 for'the reception of thecorrespondingly beveled end of a chaser 4, and comprising further aclamping element 5 having an overturned or, flanged edge 6 adapted tofit Within a correspondingly shaped recess 7 in the chaser 4, saidclampingelement in conjunction With suitable retaining bolts 8, 8, beingadapted to hold the said chaser firmly on its seatin-the holder. Meansis also provided including a lever 9 pivotally secured at 11 to the saidholder and an eccentric adjustingbolt 12 operatively connected with thelever for adjusting the chaser t in the holder, the manner in which thesaid lever 9 is connected with the chaser and the method by means ofwhich the adjustment is made being fully set forth in the aforesaidcopending application of WVarren E. Glaspey and Frederic W. Cox, but byreason of the fact that this feature of the construction has no directbearing upon the present invention, the details of this device maybepassed over.

As best illustrated in Fig. 2, the holder and the clamping element 5have inclined abutting surfaces 13 and 14, and by reason of, the factthat in operation these surfaces normally meet only at the lower edgeofthc clamp. 5, tightening of the bolts 8, 8, has a tendency not only toforce the chaser down, into the recess 3 but also to shift the'clampingelement rearwardly in such manner as to pull the chaser tightly againstthe holder. All'this has been fully set forth and claim-ed in thecopending application ofVVarren E. Glaspey and Frederic V7. Cox, SerialNumber 598,575. 7

It hasbeen found, however, that under some circumstances there has beendifliculty in retaining the chaser 4 in'precise adjustment in theholder,and difficulty has also been experienced in ad usting the chaseraccurately in the holder. e have discovered that by'knurling or suitablyscoring engagingjsurfaces of the clamping element 5 and the .chaser 4,the difficulty of adjustment and of retaining the adjustment is entirelyeliminated. Thus, as clcarly'illustrated in Figs. 3 and 4;, We may knurlor otherwise roughen the edge 15 of the chaser 4 which fits in back ofthe edge 6 of the clamping element 5, or.

the contacting surface 16 of the clamp 5, or both the surfaces 15and'lfi, and as illustrated in the drawings the knurlings preferablyextend transversely of said'surfacesj Such knurling or roughening ofthese parts entirely eliminates any tendency of the.

chaser to slip from .its'adjusted position when the clamp is tightened.

We claim: 1. In a die head, the combination of a chaser holder, a clampadaptedto engage a chaser in the holder, and means for exerting pressureon the clamp, the said holder and the said clamp having cooperatingopposed gripping surfaces, for holding the chaser When pressure isapplied to the clamp and along Which the chaser is linearly adjustablewhen the clamp'is released, and one of the said surfaces being groovedor knurled in a direction transverse to the direction of the aforesaidlinear adjustment.

2. Ina die head, the combination of a chaser holder, a clamp adapted toengage a chaser in the holder, and means for exert ing pressure on theclamp, the said holder and the said clamp having cooperating op,- posedgripping surfaces for holding the chaser when pressure is applied to theclamp and along which the chaser is linearly adjustable When the clampis released, the said surface on the holder being smooth and the saidsurface on the clamp being grooved or knurled in a direction transverseto the direction of the aforesaid linear adjust ment.

3. In a die head, the combination of a chaser, a chaser holder having aseat for the chaser, a clamp mounted on the holder and adapted to engagethe chaser, means for eX erting pressure on the clamp, the said holderand the said clamp having cooperating opposed gripping surfaces forholding the chaser when pressure is applied to the clamp and along whichthe chaser is linearly adjustable when the clamp is released, and theengaging surfaces of the chaser and the clamp being grooved or knurledin a direction transverse to the direction of the afore said linearadjustment.

4-. In a die head, the combination of a chaser having longitudinalthread grooves in one face thereof and having a longitudinal beveledsurface and an opposed longitudinal gripping surface, a chaser holderhaving a beveled seat for engaging the beveled surface of the chaser,and a clamp having a gripping surface adapted to engage the grippingsurface of the chaser, one of the" said gripping surfaces beingtransversely grooved or knurled so that the chaser may be more firmlyheld by the clamp against longitudinal movement.

5. In a die head, the combination of chaser having longitudinal threadgrooves in one face thereof and having a longitudinal beveled surfaceand an opposed longi tudinal gripping surface, the said chaser alsohaving a longitudinal groove adjacent the said gripping surface, achaser holder having a beveled seat for engaging the beveled surface ofthe chaser, and a clamp having a gripping surface adapted to engage thegripping surface of the chaser and also having a flange adapted to enterthe groove in the chaser, the said gripping surfaces of the clamp andchaser being transversely grooved or knurled so that the chaser may bemore firmly held by the clamp against longitudinal movement.

6. For a die head, a chaser having longitudinal thread grooves in oneface thereof and having a longitudinal beveled surface and an opposedlongitudinal gripping surface, the said gripping surface beingtransversely grooved or knurled so that the chaser may be firmly held bya clamp against longitudinal movement.

7. For a die head, a chaser having longitudinal thread grooves in oneface thereof, and having a longitudinal beveled surface and an opposedlongitudinal gripping surface and also having a longitudinal grooveadjacent the gripping surface, the said gripping surface beingtransversely grooved or knurled so that the chaser may be firmly held bya clamp against longitudinal movement.

FEEDER-1G WV. COX. CHARLES F. COX.

